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Effect of CO2 and natural surfactant of crude oil on the dynamic interfacial tensions during carbonated water flooding: experimental and modeling investigation

Lashkarbolooki, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.petrol.2017.09.023
  3. Abstract:
  4. Carbonated water has been recently proposed as an enhanced oil recovery method for crude oil reservoirs. Interfacial tension (IFT) plays a crucial rule on the displacement of trapped oil ganglia in the porous media. This investigation is designed to systematically assess the dynamic interfacial tension (DIFT) of two different types of crude oils with carbonated water (CW). In addition, the measured experimental data were applied into specified models. The DIFT behavior of acidic and non-acidic crude oil samples/CW and deionized water (DW) are also compared to find the effect of dissolved carbon dioxide in water on IFT. At the next stage, DIFT of all the results were used through three different models namely diffusion-controlled, mono-exponential models and an empirical equation. In this way, induction, adsorption (i.e. relaxation or rapid fall), equilibrium and meso equilibrium times, diffusivity of surface active materials in the crude oil to the crude oil/aqueous phase interface (DSA) and surface excess concentration of surface active components (ГSA) of CW systems are calculated and compared with those of the crude oil-DW systems. While IFT reduction is considered as an effective mechanism of CW injection for more oil recovery, the obtained results in the current investigation show a contradicting trend. In details, the dissolved CO2 reduces the pH of the aqueous phase, consequently, increases the basic natural surfactant ionization. The obtained results show that domination of ГSA reduction compared to the ionization of basic natural surfactant leads to IFT enhancement. © 2017 Elsevier B.V
  5. Keywords:
  6. Acidic and basic crude oil ; Carbonated water ; CO2 ; Enhanced oil recovery (EOR) ; IFT ; Carbon ; Carbonation ; Deionized water ; Interfaces (materials) ; Ionization ; Oil well flooding ; Petroleum reservoir engineering ; Petroleum reservoirs ; Phase interfaces ; Porous materials ; Surface active agents ; Well flooding ; Carbonated waters ; Dissolved carbon dioxide ; Dynamic interfacial tension ; Effective mechanisms ; Surface active components ; Surface active materials ; Surface excess concentration ; Enhanced recovery ; Carbon dioxide ; Crude oil ; Enhanced oil recovery ; Experimental study ; Numerical model ; Steam injection ; Surface tension ; Surfactant
  7. Source: Journal of Petroleum Science and Engineering ; Volume 159 , 2017 , Pages 58-67 ; 09204105 (ISSN)
  8. URL: https://www.sciencedirect.com/science/article/pii/S0920410517307271